Time Duration Calculator

Choose a start and end time to find the hours and minutes between them. If the end is tomorrow, turn on “End is the next day”.

Choose two times

Start time

Use the time picker or follow the format shown by your browser.

End time

Use the time picker or follow the format shown by your browser.

If your browser has no time picker, enter a 24-hour time as HH:MM, for example 09:00.

End is the next day

Leave this off for the same day. Turn it on when the end time is on the following day.

Time between the two times

Choose a start and end time to see the duration.

The end time is on the same day.

Clock-time difference only. Time zones and daylight saving changes are not included.

Calculation details

The end can be on the same day or the following day. The longest supported interval is 47 hours 59 minutes.

Decimal hours are another way to write the same duration. For example, 8 hours 30 minutes is 8.50 hours, not 8.30.

How to calculate the time between two times

Choose the start time, then the end time. Use the time picker or the format your browser shows.
Leave “End is the next day” off for a same-day interval. Turn it on when the end time is on the following day, including midnight.
Read the hours-and-minutes answer. Open Calculation details for total minutes and decimal hours, or copy or print the qualified result.

A small calculator with clear results

Two time fields and one end-day choice, without dates, seconds or extra measurements.
One hours-and-minutes answer with the same-day or next-day rule shown beside it.
Total minutes and decimal hours stay in closed calculation details, where they are explained.
Copy and print include the entered times, end-day rule and the limits of the result.

When this calculator is useful

Find the clock-time duration of a class, meeting, study session or planned activity.
Check an overnight interval when you know the end is on the following day.
Convert the same duration to total minutes or decimal hours without changing the main answer.

Same day, next day and decimal hours

For the same day, subtract the start time from the end time. An earlier end time is an error, not an automatic overnight assumption. Select the next-day checkbox only when it matches your interval.

With the next-day checkbox on, one nominal 24-hour day is added before subtraction. Equal clock times mean zero on the same day and 24 hours on the next day. A next-day end later on the clock can produce more than 24 hours.

Midnight is 00:00 in 24-hour notation or 12:00 AM on a 12-hour picker; noon is 12:00 or 12:00 PM. Midnight starts a day. For 22:00 to midnight tomorrow, select the next day.

Decimal hours divide total minutes by 60. A duration of 8 hours 30 minutes is 8.50 hours, not 8.30. Calculation details round decimal hours to two places and mark an approximate value when needed; the main answer keeps exact whole minutes.

Time-duration examples

Same day: 09:00 to 17:00 is 8 hours. The next-day checkbox stays off.

Same day: 09:58 to 13:57 is 3 hours 59 minutes. The minute difference is handled directly.

Following day: 22:30 to 06:15 is 7 hours 45 minutes when the next-day checkbox is on.

09:00 to 17:00 on the following day is 32 hours. Equal 12:00 times give zero on the same day or 24 hours with the next-day checkbox on.

What this result does not include

This is nominal clock-time arithmetic at minute precision, not elapsed time between real dated instants. A daylight-saving change or different time zone can change actual elapsed time.

Only the same day and the immediately following day are supported. There are no dates, seconds, extra-day counts, break deductions, work schedules or payroll rounding.

Do not use the answer as a flight duration between different time zones or a payroll or legal determination. The related Date Calculator counts calendar dates; it does not add missing time-zone information.

Your entries and browser controls

The calculation uses the values in this page's memory. This tool adds no input upload, account, saved history or input-bearing URL; the surrounding site still has its existing network and analytics integrations.

Your browser or device controls the time picker's format and appearance. App text is localized, but the picker may use a different language or AM/PM presentation. Follow its shown format; use HH:MM if it falls back to a text field.

Time Duration Calculator questions

Choose the start and end times and turn on “End is the next day”. For 22:30 to 06:15 the result is 7 hours 45 minutes. The calculator does not assume a next-day end from an earlier clock time.

The same-day answer is 0 minutes. With “End is the next day” on, the answer is 24 hours. The day choice makes the intended interval explicit.

With the next-day checkbox off, both times belong to the same day, so an earlier end would be before the start. Correct the times or select the next day if that is what you mean; they are never silently swapped.

Yes. If the end is on the following day and later on the clock, the duration is longer than 24 hours. For example, 09:00 to 17:00 the next day is 32 hours. The maximum here is 47 hours 59 minutes.

Decimal hours are total minutes divided by 60: 8 hours 30 minutes becomes 8.50 hours. They are shown in Calculation details to two decimal places, with an approximation marker when rounding changes the value.

On a 24-hour picker, midnight is 00:00 and noon is 12:00. On a 12-hour picker, use 12:00 AM for midnight and 12:00 PM for noon. Choose the next day when the end is midnight tomorrow.

No. It subtracts clock labels using nominal 24-hour days. For actual elapsed time across a clock change or between time zones, you need dates and time-zone information that this tool does not ask for.

No. It gives the clock-time interval between the two entries. It does not subtract breaks, apply workplace rules, calculate pay or make a legal determination.

Sources and calculation method

Each clock time becomes a whole number of minutes after midnight. The chosen end day determines whether 1440 minutes are added.

The browser controls the picker's appearance and may show AM/PM. The calculator uses minute precision and makes no daylight-saving or time-zone adjustment.